Pet movement issue

I have recently come back to UO after several years’ absence. I am working on a tamer and have been having a consistent problem when my pet aggro’s on something it just freezes its position and won’t move. Once it has this problem, nothing short of logging out and back in seems to fix it. Once the object of its aggro is killed, it will move again. It is of course highly irritating when it is in guard mode and it just freezes in place and the attacking mob is free to come after you. Is there a way around this? Thanks.

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